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Class 11 Mcq

Class 11 Chemistry के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

Chemistry50 mL of a 0.5 mol L^-1 solution contains 0.025 mol solute. If it is concentrated by evaporation to 25 mL, what will be the molarity?Class 11Chapter 01: SolutionsLevel 4EasyChemistryA solution has a molarity of 0.4 mol L⁻¹ and a volume of 250 mL. What volume of a 0.1 mol L⁻¹ solution of the same solute will contain the same number of moles?Class 11Chapter 01: SolutionsLevel 4MediumChemistryWhat is the approximate mass percentage of sodium chloride in a 1.0 molal sodium chloride solution? Molar mass is 58.5 g per mol.Class 11Chapter 01: SolutionsLevel 4MediumChemistry40 g sodium hydroxide is dissolved in 500 g water. What is the approximate mole fraction of sodium hydroxide?Class 11Chapter 01: SolutionsLevel 4MediumChemistry10 mL ethanol is mixed with water to make 250 mL solution. Then 50 mL of this solution is diluted to 200 mL. What is the volume percent of ethanol in the final solution?Class 11Chapter 01: SolutionsLevel 4MediumChemistryWhat is the molarity of sodium ions in 0.1 mol L^-1 sodium sulphate solution, assuming complete ionisation?Class 11Chapter 01: SolutionsLevel 4EasyChemistry98 g sulphuric acid is dissolved in water to make 2 L solution. If the acid completely gives two hydrogen ions, what is the molarity of hydrogen ions?Class 11Chapter 01: SolutionsLevel 4MediumChemistryIn a solution, mole fractions of solute and solvent are equal. If molar masses of solute and solvent are 60 g per mol and 18 g per mol respectively, what is the approximate mass percentage of solute?Class 11Chapter 01: SolutionsLevel 4MediumChemistry15 g solute is dissolved to make 300 mL solution. If molar mass of solute is 75 g per mol, what is the molarity of the solution?Class 11Chapter 01: SolutionsLevel 4EasyChemistryA 25 percent by mass solution contains a solute of molar mass 50 g per mol and water as solvent. What is the approximate molality?Class 11Chapter 01: SolutionsLevel 4MediumChemistryA solution contains 58.5 g sodium chloride and 180 g water. What is the approximate mole fraction of sodium chloride?Class 11Chapter 01: SolutionsLevel 6MediumChemistryWhat is the approximate mole fraction of glucose in a 2 molal aqueous glucose solution?Class 11Chapter 01: SolutionsLevel 8MediumChemistryA solution has solute mole fraction 0.02. If the solvent is water, what is the approximate molality?Class 11Chapter 01: SolutionsLevel 10HardChemistryWater contains 9 ppm dissolved oxygen. What is the approximate mass of oxygen in 500 mL water?Class 11Chapter 01: SolutionsLevel 6MediumChemistryThe mole fraction of water in a solution is 0.9. If moles of water are 9, how many moles of solute are present?Class 11Some Basic Concepts of ChemistryMole concept and molar massLevel 7MediumChemistryA solution has 10 percent solute by mass. What is the mass percent of solvent in the same solution?Class 11Chapter 01: SolutionsLevel 3EasyChemistryA 2 L solution has solute concentration 300 mg per litre. What is the approximate ppm if the solution is dilute and aqueous?Class 11Chapter 01: SolutionsLevel 5EasyChemistryIf a solution is heated and its volume increases while moles of solute remain the same, what happens to molarity and molality?Class 11Chapter 01: SolutionsLevel 5EasyChemistryWhich statement about concentration units is most correct?Class 11Chapter 01: SolutionsLevel 4EasyChemistryWhy is the mole fraction of solute in a 1 molal aqueous solution around 0.0177?Class 11Some Basic Concepts of ChemistryMole concept and molar massLevel 4Medium